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late model gas tank, in early model car

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    #1

    late model gas tank, in early model car

    As the post above states... Has anyone had any experience? i've searched around and can't seem to find any useful tutorials or good explanations of what needs to happen in order to make this swap work. If anyone has any good write ups they would be greatly appreciated. Thanks in advance!
    -Cheers
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    #2
    you are better off just finding the right tank for the car you have. early cars have two pumps. some tanks have two holes in the top, some have one. sucks you are in michigan where everything is rusty. go blue!
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      #3
      yeah, i've rebuilt about 7 of these cars and never once ran into a rusty gas tank. But the old model ones you can't buy new for under 500 bucks and mostly only from BMW. The late model ones are a lot more abundant, so it seems. I've found new late tanks for 240 on parts geek and sites like that. I'm not trying to spend 500 on this car, considering it will be driven through the winter this year, just trying to keep myself from the fire look driving down the freeway.

      "I know a lot about cars, I can look at the headlights and tell you exactly what way they are coming."

      Cheers man, Thanks for the help!

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        #4
        It actually wouldn't be too hard-
        you 'd need the late in- tank pump and senders,
        and then replumb and rewire accordingly.
        If you got the entire tank with accessories-
        and fuel gauge, they're different- it shouldn't hurt too badly.

        I run a late in- tank pump in an early tank, and that was
        pretty easy to do. Had to add a return, reroute the hoses,
        and add a heavier- gauge wire up to the pump.
        now, sometimes I just mess with people. It's more entertaining that way. george graves

        Comment

          #5
          My first big fook-up was crushing gas tank with jack, I was like ... ahhh ... Jack's going up ... ahhh ... but car is not... ahhh.. lol.

          Anyways, replaced it with larger oem tank, it fits just fine., lots of crap to get off before you'll get to it but...
          it is a very easy job.,
          You might also want to swap your OBC chip with one from donor vehicle so your
          OBC range readings will be correct

          Aloha.

          Comment

            #6
            Originally posted by TobyB View Post
            It actually wouldn't be too hard-
            you 'd need the late in- tank pump and senders,
            and then replumb and rewire accordingly.
            If you got the entire tank with accessories-
            and fuel gauge, they're different- it shouldn't hurt too badly.

            I run a late in- tank pump in an early tank, and that was
            pretty easy to do. Had to add a return, reroute the hoses,
            and add a heavier- gauge wire up to the pump.
            Do you know of any good write ups on the subject?

            Comment

              #7
              Originally posted by fporro View Post
              My first big fook-up was crushing gas tank with jack, I was like ... ahhh ... Jack's going up ... ahhh ... but car is not... ahhh.. lol.

              Anyways, replaced it with larger oem tank, it fits just fine., lots of crap to get off before you'll get to it but...
              it is a very easy job.,
              You might also want to swap your OBC chip with one from donor vehicle so your
              OBC range readings will be correct

              Aloha.
              it wasn't a fuck up. I am a mechanic , I have a 2 post, (if you crush a tank with a 2 post or a low boy for that matter, you should quit working on cars immediately) It was a simple rust hole, i live in michigan after all. I am just new to this forum, not a noob. I have the donor vehicle cluster in my car already, and took the obc with it, but no one has told me what wires to run, or where to re route what to what or how, Or what wires to splice into to make the siphon pump work if/ I need to remove the hp pump or if it can stay. this seems to be a grey area of how to make your tank work. Ive got everything I need, even new fuel pipes from a late model car. But just trying to figure out what i need to do to not go BOOM. haha

              Comment

                #8
                I don't know of anything in the write- up department.
                When I did mine, I just looked at the two cars, figured
                out the easiest way to route the plumbing,
                and made sure the return went back into the right place.
                I extended the wire at the external pump simply because
                the lift pump has a smaller wire extending from the main
                pump to the lift pump.
                If you use a sender from a 1991 318is, Jim Levie says it should
                already have the return pipe attached, if you need an extra.
                Which you shouldn't, as really all you have to do is make sure the return
                line is feeding the return inlet (scavenge line) on the late tank.

                I labelled shit as I went, but I didn't think to take pictures- sorry...

                Oh- the biggest pain would be cutting the access hole for the left- side gauge sender...

                t
                now, sometimes I just mess with people. It's more entertaining that way. george graves

                Comment

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